Saw-sharpening machine.



No. 654,829. Patented luly'3l, I900.

- L. L. FILSTBUP.

, SAW SHARPENING MACHINE.

(Application filed 1m. 24, 1900.

2 Sheets-Sheat I,

(No Model.)

jizz/eizr/ 12215 .Z. is irw W No. 654,829. Patented, July 31,4900.

L, L. FILST'RUP.

SAW SHARPENING MACHINE.

(Application filed Mar. 24, 1900.)

(No Model.) 2 Sheets-Sheet 2,

=/ I I l HHHI I c I l I J H e I l m: mam; man an. mTo-ufna, wnsnmm'um-nla UNITED STATES PATENT FFICE.

or ONE-HALF TO HENRY P. SCHOFIELD, OF SAME PLACE.

SAW-SHARPENING MACHINE.

srnelrrca'rron formingpartof Letters l atent no. 654,829, dated July 31, 1900.

Application filc lllilaroh 24,1900. 'sainnaaesaoromoaa.)

To all whom it may concern:

Beit known that I, LARS L. FILSTRUP, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and-usefulItnprovem ent in Saw-Sharpening Machines, of which the fol lowing is-a specification"? My invention relates particularly to improvements in saw-sharpening machines for circular saws.

My object is to provide improved feed mechanism'andimproved arboradjustmentformachines of this character.

The accompanying drawings illustrate my improvements inconnection with so much of a saw-sharpening machine as is necessary for a clear understanding.

In the drawings, Figure 1 is a viewin front elevation of a saw sharpening machine equipped with my improvements; Fig. 2, an enlarged fragmentary plan view of the front end of the machine; Fig. 3,v a section on line 3 of Fig. 2; Fig. 4, a perspective view of the inner or shorter feed-arm; Figs. 5 and 6, perspective views showing in detail the outer or longer two-part feed-arm; Fig. '7, an enlarged broken section at line f Fig. 1, showing the arbor adjustment; and Fig. 8a section at line 8 of Fig. 7. a

A represents a frame of ordinary construction having vertical guides-0t for the usual vertical adjustment of the arbor; B, a crossguide of common construction adj ustably connected with the guides a; C, a grindingwheel mounted in the usual manner; D, a guide-piece or rest which is pivoted at b and bears on the margin of the saw at the outer face thereof; D, a cam or look pivoted at b and serving to lock the guide-piece D inlthe usual manner; E, an adjustable stud or bolt which projects from the upper part of the front end of the frame and forms a guide member coacting with the member D; F, a

saw in position for grinding; G, a feed-armactuating lever which projects through a slot 0, Fig. 8, in the frame and is reciprocated in the usual manner; H, an inner short feedarm provided at one end with a feed-fingerol and at the opposite end with a pivotal bearing-head d and eccentrically-placed perforation d I I, an outer two-part" curved feedarm, the part I being provided with a bearing-head e, eccentrically-placed perforated bolt-receivin g lug e, and l en gth-ad j ustin g slot 6 and the part I being provided at one end with an adjusting-head e having a perforation e and at the opposite end with a feedfinger e 1?, a bolt for adjustably fixing the parts I I firmly together; 1 a pivotal bolt joining both feed-arms to the actuating-lever; J, avertically-disposed cross-slide mounted on the guide B; J, a screw for adjusting said slide on the guide B in the usualmanner; K, an arbor-socket connected with the slide J and afiording a central inner-face guide or bearing; K, an arbor; K Fig. 1, an arborwasher afiording a central outer-face guide or bearing, and K a cotter-pin.

The slide J is provided with an internallythreaded split ring to receive the externallythreaded arbor-socket, lugs f, connected by a screw-bolt f, being provided for tightening the ring upon the socket. Said socket has a central threaded perforation for the. threaded shank of the arbor and a recessed outer face to permit a shoulder g at the arbor-shank to be beneath the outer face of the socket. The arbor-washer is notched on its outer surface with recesses of different depth to present different thicknesses of metal between the saw and cotter-pin, according to the position of the washer, and thus to accommodate saws of different thickness in a well-understood manner.

The upper end of the actuating-lever G presents a fiat elongated head, afiording a bearhead of the feed-arm H in either one of, two positions, for which provision is made by supplying two perforations for the bolt I to vary the feed.

member I permits it to pass and move heneath the grinding-wheel and that the feedfingers of the two arms engage teeth on opposite sides of said wheel. By means of the bolt-and-slot connection between the two parts of the longer feed-arm the latter may be adjusted in length so that both feed-fingers engage teeth and press upon them simultaneously in feeding, or (less desirably) one feed -finger may be caused to fall slightly ing-face of considerable area for the adjacent It will be noted that the curved form of the v short of contact, so that one arm shall ordinarily accomplish the feeding while the other works idly for the most part. In either case if one of the fingers should meet with a broken tooth and fail to feed properly the saw would, 'nevertheless,be advanced by the other finger working alone. that the fingers should meet simultaneously with broken teeth, an uninterrupted feeding is practically assured. f

It will of course be understood by those skilled in the art that the upper end of the lever G is moved back and forth intermittently in a plane parallel to the front ofthe x 5 machine by any suitable agency. Ordinarily the feed-arm-actuating lever is pivoted to the frame, though no pivotal connection is shown in the accompanying drawings.

per end of saidlever moves toward the grinding-wheel the saw is advanced one tooth, and in the reverse movement 1 each feed -finger slips over its next succeeding tooth. The reactive force exerted by the saw upon the feedarms and the force acting at the pivotal con- 2 5 nection of the arms produce a turning movement which the eccentric bearing-heads. of said arms are adapted to meet. .This is apparent when it is considered that these forces act in difierent planes, whence it follows that of their proper plane and toward'the saw.

tomatically grind the teeth as they are presented one by one to said wheel.

If found desirable in any case,

the means feed-arm maybe replaced by any suitable ""siiflicient for the purpose, notwithstanding it isimportant that the two feed-fingers shall bear with the same force, so that there shall Since it could rarely occur As the upthere is a tendency for the arms to turn out The grinding-wheel and its gate are moved in the ordinary or any suitable manner to au-' shown for adjusting the length. of the long means for effecting a finer adjustment. I have thus far found the adjustment described quite be no noticeable inequality in feeding shouldsaws, the combination with frame, arbor and grinding mechanism, offeeding mechanism, comprising a feed arm actuating device, a curved feed-arm connected with said actuating device and provided with a feed-finger for engaging the saw at the farther side of the grinding-wheel, and a shorter feed-arm connected with saidactuating device and provided with a feed-finger for engaging the saw on the near side of said wheel, substantially as and for the purpose set forth.

2. In a machine forsharpening circular saws, the combination with frame, arbor and grinding mechanism, of feeding mechanism, comprising a feed arm actuating device, a

feed-arm pivotally joined to said actuating device and provided with afeed-finger for engaging the saw at the near side of the grinding-wheel, and a two-part feed-arm comprising a member I having a pivotal perforation and an eccentric bearing-surface and a curved member 1 ad justably connected at one end to the member I and provided at the opposite end with a feed-finger for engaging the saw on the farther side of the grinding-wheel,substantiallyas and for the purpose set forth.

3. In a machine for sharpening circular saws, the combination with frame, arbor and sharpening mechanism including a grindingwheel, of feed mechanism, comprising an ac tuating-lever G having a fiat-faced bearinghead, a feed-arm having a flat bearing-head bearing against the first-named head, a feedarm having a flat-faced head bearing against said second-named head, and a pivotal bolt joining said heads, substantially as andfor the purpose set forth 4. In a machine for sharpening circular saws, the combination with frame, sharpening mechanism and feed mechanism, of an adjustable arbor-support, provided with a split internally-threaded ring,an arbor-socket screwed into said support, and means for tightening said. ring upon said socket, substantially as and for the purpose set forth.

LABS L. FILSTRUP. 

